Industrial Valves
SCHROEDAHL SUL
“Low to medium pressure applications”
The SUL is a compact automatic recirculation valve (ARV) designed to protect centrifugal pumps against overheating, cavitation, and unstable operation during low or no-flow conditions. It is a cost-effective solution for lower differential pressures, offering simple design, easy installation, and low maintenance. The valve automatically opens the bypass when flow drops below the minimum required and closes it as normal flow resumes. No external power or control system is required.
Typical industries: Power, chemical, petrochemical, water systems
Key Features:
- Automatically modulating bypass
- Integrated non-return (check) function
- Single-stage pressure reduction
- Internal, self-operated (no actuator)
- Compact cast housing
- Low noise and low wear
Technical specifications:
Nominal diameter
DN 25–250 / NPS 1–10
Pressure class
PN 10–63 / Class 150–300
Temperature (max.)
Up to 230 °C / 446 °F (other temperatures on request)
Housing material
1.0619 / A216WCB, 1.4408 / A351CF8M,1.4410 / A9955A, 1.4501 / A9956A
Housing type
Cast
Media
Liquids of all kinds (water, oils, chemicals, and others)
Flanges
EN 1092-1, ASME B16.5, ISO 7005, JIS, JPI
Designs
Vertical installation, horizontal installation, drain hole, optional non-return design for particles (with wiper)
Number of stages (max.)
1
Number of controlled stages (max.)
1
Operating range (max.)
Delta up to max. 20 bar (water)